I'm happy with mine. If you read the article in my post above it gives you an idea what to expect. It will be a little slower in some games by looked 10% maybe. But when you get to where you are doing more multitasking it will slaughter the i5.
Plus, a lot of guys are saying games will move towards being more multithreaded, both the Xbox one and PS4 are 8 core cpus. So as games move that way, you will want the extra cores and extra threads.
Me personally I had an overclocked FX 6300 6 core before, and there 1600 especially overclocked is much smoother on games etc.
As for 1600 be 1600x, the 1600x is faster, but they are both 6 core, both can overclock, and 1600x does not include a cooler with it in the box. The stock cooler with the 1600 is actually decent, so a lot of guys are buying the 1600 to save money, then overclocking to around the same performance as the 1600x can go to.
But games, in single thread titles, 7600k will be slightly better, but when you start getting to where the cpu has to do a lot at once, there 1600/1600x will own it.